Condenser



N. DEISCH CONDENSER Fab.` 7, 1933.

Filed Augg?, 1950 14 Sheets-Sheet 1 2 3 4 n w Il". 0 n l N .w l ,I Hl nTn@ M wl.. H i n @B l I. Q Q m w. r..- 1X1--- ---2-111% ----Illlii...

lllll L n n FIG. 2 Noel Del's'cb FebE 7, 1933. N DElsCH 1,896,942

GONDENSER 4 Sheets-Sheet 2 l Noel Del'sch emma Feb. 7, 1933. N DElsCH1,896,942

CONDENSER Filed Aug. 20, 1950 4 Sheets-Sheet 3 30 l2 la 30 le l NolDez'sch ttormqa Feb. 7, 1933. N DElSCH 1,896,942

CONDENSER Filed Aug. 20, 1930 4 Sheets-Sheet 4 FIG. 15 w, fz'mf//Mwm'Patented Feb. 7, 1933 PATENT oi-FicE NOEL DEISCH, F WASHINGTON, DIBTBIGI0F LUIBIA.

OONDENSEB application mea augm so. 1930. serial no. 47am.

rotors and, in its more specific application,`

including manually actuated means for effecting the movements of thestator relatively to the rotor elements to make the compensatingcapacityl adjustments initially, said means being associated withmechanism that is set or adjusted by the operation of said manual meansto eiect the subsequenty capacity adjustments automatically, when therotor elements are actuated for a given dial setting.

v The invention `is illustrated in the accompanying drawings, in whichF1 1 is a front elevation, partly in section, u of a t ree gangcondenser involving the novel structural and operative rinciples.

Fig. 2 is a rear elevation with part of the casing broken away.

Fig. 3 is a section on line H of Fig. 1.

Fig. 4 is a section on line 474 of Fig. 1.

Fig. 5 is a plan view of the'condenser, portions thereof being shown infragmental section.

Fig. 6 is a fragmentary front elevation of one of the disks or faceplates and the associated cam with the means for mounting the letter.

Fig. 7 is a rear elevation of the mechanism o shown in Fig. 6. v

i Fig. 8 is a fragmentary section through the face plate, illustratingthe construction and arrangement of the cam and one of the runners. 45Fig. 9 is a similar view showing the form of the vend runners to preventmovement of the cam in a direction normal to the face plate.

Fig. 10 is a similar view showing theV intermediate runner and the modeof locking the same to the cam to prevent movement of the cam in thedirection of its length.

Figs. 11 and 12 are fragmentary elevations illustrating the mode ofattaching the shaft bearings to the casing.

Fig. 13 is a front elevation of a cabinet carryingan installation of athree gang condenser made in accordance with the present invention.

Fig. 14 is a fragmentary front elevation 60 of the cabinet showing a slihtly modified form in which the correcting evers are normally concealedbehind a hinged door. Fig. 15 is a circuit diagram sho the mannerinwhich a gang condenser invo the invention is connected in a typicalmultista e receiving circuit.

rtain tumng condensers, as now made, are providedvwith means forsecuring a ca'- pacity adjustment to compensate differences of impedancewith the various sub-circuits of a multi-tuned circuit-at diterentdialsettings, but these adjustments must, however, be made by themanufacturer or by skilled service operatives provided with special 7sequipment therefor. vA factory made adjustment is frequently subject todisarran ment as the result of rough handling in shipment. Furthermore,the characteristics of the 'particular receivin aerial used by the soset, as installed, will etermine, inl a large measure, the impedance ofthe aerial-ground sub-circuit and it will be apparent that this factorcannot be taken care of adequately at the factory. In addition to thesefacts and a5 conditions which render factory adjustments unsatisfactory,the impedances of the several sub-circuits may be changed subsequent toinstallation, due to a substitution made in some element in the circuit,such as the receiving'antenna or one or more thermionic tubes. As shown,the present invention makes it possible for an unskilled operator of aradio receiving set to make the compensating capacity adjustments at anytime the latter may be found nry, so that he may be assured that his setis always workin at highest eiciencyn n t e accompanyin wings, einvention, in its preferred form, is illustrated as applied to a threegang condenser, such as commonly employed in radio receiving sets,

i susceptible of a but it will be understood that the invention isapplicable to a single condenser or to any desired number o associatedcondensers.

Referring to the drawings, 1 indicates the usual housing or casing nowemployed as a shield for the condenser or condensers, on the ends ofwhich casing 'there are mounted plates t and 6 in which are adjustablymounted the journal bearings 3 and 5 'for the shaft 2 carrying therotors of the gang condenser,

one end of the shaft having mounted there-- the respective membersalternate in various degrees of overlap, when the rotor is operated tobring the'elements of the condenser into cooperative relation. Thestator element of each'condenser is not strictly static,

but is so constructed and arranged as to be limited range of movementtoward and from the rotor. As stated, the

' stator is supported at one end by a spring bracket 14 and the otherend of the stator is provided with an insulating postor toot 16 securedto the cross bar 15 of the stator,

which post 16 rests on the short arm ot a lever 17, which is pivoted ona. shaft or rod 18 fixed' to the ends of the casing. 1. the longer armof the lever extending out through the slotted opening in the ront ofIthe casing. The several levers 17, `which are associate with theseparate condensers. are spaced on the shaft or supporting rod 18 bymeans of sleeves 19, so that said levers are retained in proper relationto engage the Vinsulating p osts 16 upon which the ends of therespectlve stators rest.

From the foregoingvdescription, it will be apparent that movingthe freeends oi the levers 17 manuallv will effect the movement of thecorresponding stators into greater or lesser overlapping` relation withthe coacting rotors and therefore vary the capacities ot the respectivecondensers. i

In making adjustment for a given dial setting (as. for example 650kilocycles, as indlcated 1n Fig. 13) the operator manipulates the threelevers 17, moving them up and down until a maximum response is secured.The usual procedure will be to progress with the corrective adjustmentof the levers from the antenna circuit to the detector circuit usually'from left to right, the operation preferably being performed twice inrotation, due to the .or in part.

incassa slight retroactive mutual tuning action of the circuits. Thisadjustment of the several condensers is somewhat analogous to a vernieradjustment in its edect, but, inthe present case, when once made, it ispermanent for a given setting, that is tosay, if the tuning d ial isturned to some other setting and subsequently turned hack to the readingof the first setting, the sub-circuits will be in perfect accord. lnother words, when the several levers 17 have been adjusted to move thesta-tors of the several condensers to edect the desired compensatingcapacity adjustment of the respective condensers, further manipulationof the levers in the ordinary operation of the set "will not benecessary, until and unless some changein the constants of the set makea readjustment of or desirable.

A manual adjustment of the several condensers by operation of edectivefor .a given dial setting, `would not be similarly effective for anotherand difierent dial setting, wherefore, in order to `insure the propercorrectional adjustments o the stators o the several condensersthroughout the range of the dial setting, the apparatus is provided withspecial means for automatically efdecting the correctional adjustmentsof the several stators by the corresponding levers, which are operatedby adjustable cams rotatable with the rotors, the desired adjustment ofthe cams being eected by the initial manual adjustment of the stators bytheir operating levers. To this end, there is.

associated with each of the condensers a face plate or disk 30, which isfixed to thesleeve 11 of the corresponding` rotor and, therefore,

the stator elements necessary the levers 17 while rotates simultaneouslywith the rotor. Each diskk or tace plate 30 is provided with a series ofradial slots 31, in each of which is slidd ably mounted a runner orsupport, the several runners serving to hold an adjustable cam 40 in itsvarious positions of adjustment.

- which 1s locked to the face plate against move- Said cam comprises aflexible strip of metal, j

plate or disk, but is'capable of being adjustt edradially with respectto the disk in whole body portion 32`engaging a corresponding slot 31 inthe diskwith oppositely disposed ears 33, 33 engaging the face of thedisk, a looped spring 3a serving to secure the runner to the disk with arictional force suicient to prevent displacement of the) runner, exceptby engagement with positively actuated means. Each of the runners,except those at the end and the middle of the series, i

is provided with an open slot 35 in which the cam strip 40 is engaged,as more particularly illustrated in Fig. 8. Each of the end runners 1sprovided with a slot 35' closed at l its top, which prevents movement ofthe cam Each of the runners includes a A in a direction normal to thesurface ofthe disk 30, as illustrated in Fig. 9. The middle runner isprovided with two hook-like extensions 30a, 30a overlying the slot 35,which extensions engage a slot or opening 41 in the mid section of thecam 40, thereby preventing any movement of the cam in the direction ofits length.

As stated, a disk or face plate 30 is associated with each of the rotorsand moves therewith in its various adjustments. Each of the levers 17 isprovided with a slotted ear or lug 20, which is in straddling engagementwith the corresponding cam 40, so that, when a given lever 17 is movedup or down to effeet the proper correctional adjustment of the statorwith respect to the rotor, the corresponding cam is simultaneouslyadjusted locally in a radial direction with respect to the disk by themanual movement of the engaging lever and this adjustment of the camwill be maintained by the springs 34,*which lock the runners infrictional engagement with the disk 30. AThis adjustment of the cam `fora given setting of the condenser and the correctional adjustment of thestator thereof by the lever 17 will insure the reproduction of thecorrectional adjustment, when the saine setting is repeated, by the cammoving lthe lever to the same extent that it was moved initially in themanual correctional adjustment.

It will be seen, therefore, that by moving the free ends of the leversup and down, the cam 40 is changed in shape simultaneously as thecapacity of the corresponding condenser is adjustably altered, so that,when the cams of the three condcnsers are rotated in changing the dialsetting, they simultaneously move their respective levers and stators tothe same extent that the latter were moved by the manual actuation ofthe levers, thereby securing the proper correctional adjustment of eachstator at the corresponding setting.

As indicated in Fig. 13. the levers 17 project. through slots in thecabinet or casing of theradio receiving set so as to be readilyaccessible'. and, in order to avoid accidental displacement of thelevers, the projecting `ends thereof may be shielded by a flap orclosure 5() hinged to the front of the cabinet, as illustrated in Fig.14.

The disposition and arrangement of the multi-stage condenser in aconventional circuit ot a radio receiving set is illustrated in Fig. 15.

Although the invention has been described with particular reference tothe initial manual correctional adjustments ofthe stator elements bymeans of the levers 17. which latter also set or adjust the cams toeffect the .subsequent correctional adjustments automatically, by thecams acting through the levers to move the statoz's, it will be apparentthat the cams l() may be adjusted manually,

in the first instance, to effect the correctional movements of thestators vrelatively to thethan one operator by the movement of any oneof which operators the capacity of said condenser is varied` anadjustable cam associated with one' of said o erators, a follower forsaid cam associate with another of said operators and by which the shapeof said cam is changed when said other operator is moved independently.

2. A variable condenser including an operator by the movement of whichthe capacity of said-condenser is varied and including also asupplementary operator movable both coordinately with and independentlyof said first operator by the movement of which the capacity of saidcondenser is varied, a mechanical coupling between said first operatorand said second operator by which said second operator is moved asafunction of the movement of said first operator, and means associatedwith'- said coupling by which said coupling is changed to change saidfunction when said second operator is moved independently ofsaid firstoperator.

3. A variable condenserl including rotor and stator members, a lever forinitially adj usting' the stator relatively to the rotor, an adjustablecam movable simultaneously'with the motor, and connections between thelever and the cam whereby the-movements of the lever to effect theinitial adjustment of the stator will set the cam to effect theselective adjustment automatically.

4. A variable plate condenser, comprising a rotor member, an (adjustablecam fixed thereto, a stator member mounted for limited movementxrelative to the rotor,y manually operated means for moving the statorto initially effect compensating capacity adjustments between the rotorVand stator, and connections between the cam and the manually operatedmeans to set the cam to effect the subsequent capacity adjustmentsautomatically.

5. A variable condenser, comprising a rotor includf'ng separate leavesfixed to a rotary shaft, a stator including leaves adapted forinterposition with respect to the rotor leaves, a pivoted lever engagingthe stator leaves for manually adjusting the latter relatively to therotor leavts, a disk fixed to the rotor shaft, an adjustable cam trackmounted on said disk including a' resilient strfp carried by runnersslidable in radial slots in said disk, and al slotted lug on said leverstraddling the strip; whereby the movements of the lever effects theinitfal capacity adjustment of the condenser nue. sets the cam, andsubsequent dial setting of the condenser causes the cam to prising arotor mounted on a common shaft and a stator mounted for limitedmovement relatively to the rotor to effect compensating capacityadjustments, a lever for manually adjusting each stator, an adjustablecam for each condenser fixed to said shaft, and connections between theseveral levers andthe correspondingtcams; whereby the movements of thelevers to effect initial adjustmentl of the condensers will set the camsto repeat the adjustments through the levers upon subse-A quent dialsettings` of the condensers.

7. In a radio circuit including sub-circuits, each sub-circuittuned bymeans of a variable condenser, a common operator for coordinatelymoving'all of said condensers to different capacity settings, anauxiliary operator for each condenser to vary the capaclty of eachcondenser independently of the other condensers to achieve capacityadjustments at each common setting, an adjustable cam for eachcondenser, and setting means for each of said cams actuated by theindependent movement of the corresponding auxiliary operator andoperated by said cams to move said auxiliary operators when said commonoperator is moved, whereby the capacity of said condenser is returned tothe adjusted value at a subsequent identical common setting. 8. Tuningapparatus for radio circuits including means to change the frequency ofsaid circuit, an adjustable cam, an engaging member operatively couplingsaid cam with said frequency changing means to change the frequency ofsaid circuit as said cam is moved relatively to said engaging member,said enaging member also engaging said cam to adjust said cam when saidengaging member is moved independently of said cam.

9. `Tuning apparatus control for radio cir- I cuits including means tochange the frequency o f said circuit, a movoble Support, an adjustablecam comprising a lexible member frictionally engaged by saidsupport, anen aging member for operatively coupling said exible member wth'saidfrequency changing means to change the frequency of said circuit as saidcam with its support is moved independently of said engaging member,said engaging memj ber -also engaging said flexible member to move thelatter with respect to said support to a different stable position ofadjustment when said engaging member is moved independently of said cam.

10. A variable condenser including an operator to change said condenserto different capacity settings, an adjustable cam movable coordinatelywith said operator, auxiliary means to vary the capacity of saidcondenser,

l a cam engaging member operatively connect- 4Gli ed with said auxiliarycapacity varying means whereby said capacity varying means aeeaeea isactuated to'correct the capacity of said condenser at diderent capacitysettings, said cam engaging member also acting to change the shape ofsaid cam to adjust said cam.'

In testimony whereof l ailix m signature.

' NOEL ElSCH.

so j

